Normalize unicode signs

evaluations/evaluations/numbers.py

@@ -42,6 +42,7 @@ def extract_numbers(text: str) -> list[float]:
     parenthesised negatives. Numbers qualified by a scale word ("1.2 million")
     contribute both the raw and the scaled value, so either phrasing can match.
     """
+    text = text.replace("−", "-")  # normalize the typographic minus sign
     numbers: list[float] = []
     for token in _NUMBER_RE.findall(text):
         value = _to_float(token)

evaluations/tests/test_numbers.py

@@ -14,6 +14,9 @@ class TestExtractNumbers:
     def test_parenthesised_negative(self) -> None:
         assert extract_numbers("loss of (123)") == [-123.0]
 
+    def test_unicode_minus(self) -> None:
+        assert extract_numbers("a change of −1.9 million") == [-1.9, -1.9e6]
+
     def test_scale_word_adds_scaled_and_raw(self) -> None:
         numbers = extract_numbers("revenue of 1.2 billion")
         assert 1.2 in numbers